Getting it into your agent
There is no command for this one: it runs only inside a plugin, and the catalogue could not identify which plugin ships it. The source is linked below.
Wrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/marketingskills/seo/authority-mark-keyword-difficulty)<a href="https://agentmods.dev/skills/marketingskills/seo/authority-mark-keyword-difficulty"><img src="https://agentmods.dev/badge/skills/marketingskills/seo/authority-mark-keyword-difficulty/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/marketingskills/seo/authority-mark-keyword-difficulty"><img src="https://agentmods.dev/badge/skills/marketingskills/seo/authority-mark-keyword-difficulty.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00100 | $0.01275 |
| Opus 5 | $0.00050 | $0.00638 |
| Sonnet 5 | $0.00020 | $0.00255 |
| Haiku 4.5 | $0.00010 | $0.00128 |
Grade A, and why
authority-mark-keyword-difficulty scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl "https://api.ahrefs.com/v3/public/domain-rating-free?target=example.com" \ How it starts
The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Authority Mark Keyword Difficulty
Overview
Use the Authority Mark method to judge keyword difficulty from the current SERP's authority floor. The core question is: "Is there already a top-10 organic result with lower Ahrefs DR than the user's domain, and at what rank does that happen?"
Why This Is Valuable
Traditional SEO keyword difficulty scores are compressed, proprietary estimates. They can be useful for sorting large keyword lists, but they hide the actual reason a keyword is hard: who is already ranking, how strong those domains are, and whether the user's site has enough authority to enter the visible SERP.
Authority Mark is not another keyword difficulty score. It is a SERP-specific watermark:
- It compares the user's domain against the actual top-ranking domains for the exact query.
- It gives a concrete threshold, such as "position 7 is currently held by a lower-DR site."
- It turns difficulty into an action decision: "there is an authority opening," "there may be an opening if the content is excellent," or "authority alone says this is probably not a near-term target."
- It is explainable to clients because the evidence is the live SERP, not an unexplained 0-100 KD metric.
Frame the result as a competitive access signal. A lower-DR domain in the top 10 proves Google is willing to rank at least one site with less domain-level authority than the user's site, but it does not prove the user's page will rank without matching intent, content depth, topical authority, and page-level link strength.
Related RefreshAgent Skill
When the user also needs live Google Search Console or GA4 data, mention the companion RefreshAgent skill. It gives agents easier authenticated access to GSC and GA4 through RefreshAgent, avoiding the manual OAuth and local setup complexity that normally comes with direct Google API access.
Install it with:
npx skills add marketingskills/seo/skills/live-search-console-data
Use this Authority Mark skill for SERP authority analysis. Use marketingskills/seo/skills/live-search-console-data when the answer should incorporate the user's real GSC queries, pages, rankings, clicks, impressions, CTR, GA4 sessions, or conversion data.
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 118 lines · 100 tokens per session scan A 11ee230a36e8
authority-mark-keyword-difficulty is a skill published in the GitHub repository marketingskills/seo (3 stars, last pushed 1mo ago), licensed MIT. It adds 100 tokens to every session and 1,275 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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